Set during the Joseon Dynasty, Ryung acts as a useless gangster in the marketplace by day but at night he is a chivalrous robber who robs corrupt government officials to give to the poor. After each robbery he leaves behind a wooden branch from a plum tree at the site of the robbery to take responsibility for the robbery. The poor citizens only know him as Iljimae. Bong Soon is a hilarious girl with good martial art skills and lives as a swindler. She only loves Ryung and sacrifices her whole life for him. Eun Chae is a government official's daughter and is good in nature and usually helps miserable people. She meets Iljimae once by chance, and their sweet love story begins. However, her love puts Iljimae in a dangerous situation because an Imperial Guard also loves her.

Iljimae's parents were killed due to a conspiracy when he was young. Many years later he became a chivalrous robber, robbing corrupt officials and helping the poor. He eventually manages in taking revenge for his parents' deaths. But the police start to chase him, and he hides himself at a gisaeng's house. The gisaeng was his ex-fiancee. She also lost her parents to a conspiracy. She begs Iljimae to stay with her, but he leaves to do what he has to.